Answer:
A nonlinear function is a function in which the rate of change of the output (y) is not proportional to the rate of change of the input (x). In other words, a nonlinear function is a function where the graph of the function is not a straight line.
Here are a few examples of equations that represent nonlinear functions:
y = x^2: This is the equation for a parabolic function, which is a classic example of a nonlinear function.
y = sin(x): This is the equation for the sine function, which is periodic and nonlinear.
y = |x|: This is the equation for the absolute value function, which is nonlinear and has a "kink" at x = 0.
y = log(x): This is the equation for the natural logarithmic function, which is also nonlinear.
These are just a few examples of nonlinear functions. There are many other types of nonlinear functions, including polynomial, exponential, and trigonometric functions.